diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e90f874..0b595ad2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
     - calling pacman to read installed packages when "Repositories" and "AUR" properties are set to "false" (it would not display the packages, but the call was unnecessary being done)
     - not displaying installed AUR packages when AUR support is disabled
     - downloading AUR index during the initialization process when AUR support is disabled
+- Flatpak
+    - crashing when trying to retrieve size of runtimes subcomponents [#164](https://github.com/vinifmor/bauh/issues/164)
 - UI
     - displaying a popup when information of a given package is not available
 
diff --git a/bauh/gems/flatpak/flatpak.py b/bauh/gems/flatpak/flatpak.py
index f5e61286..bf6de2c1 100755
--- a/bauh/gems/flatpak/flatpak.py
+++ b/bauh/gems/flatpak/flatpak.py
@@ -411,12 +411,15 @@ def map_update_download_size(app_ids: Iterable[str], installation: str, version:
 
                         related_id = [appid for appid in app_ids if appid == line_id]
 
-                        if related_id:
-                            size = p2.findall(line_split[6])[0].split('?')
+                        if related_id and len(line_split) >= 7:
+                            size_tuple = p2.findall(line_split[6])
 
-                            if size and len(size) > 1:
-                                try:
-                                    res[related_id[0].strip()] = size_to_byte(float(size[0]), size[1])
-                                except:
-                                    traceback.print_exc()
+                            if size_tuple:
+                                size = size_tuple[0].split('?')
+
+                                if size and len(size) > 1:
+                                    try:
+                                        res[related_id[0].strip()] = size_to_byte(float(size[0]), size[1])
+                                    except:
+                                        traceback.print_exc()
         return res